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I may be getting older, but I refuse to grow up!
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"Only" in neutral? It could be the clutch release bearing. With the motor off, tip the bike on it's side, with the clutch on the bottom. Hold it there about 5 minutes to flood the bearing with oil. Put it back on 4 tires for 5 minutes and then start the motor, and see if the sound changes.

Still there? It almost sounds like a exhaust leak. Take about a 3ft length of hose to your ear, the other around the motor and exhaust till you pinpoint exactly where the noise is from.
 

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Have you adjusted your valves as well to make sure that sound isn't part of that?
 

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Discussion Starter #5
@morphrider are there any damages that would be caused by the valves? Like if that's what it is, what's the worst that will happen? Not very knowledgeable in specifics like that.
 

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Have you tried doing what Dez started about tipping bike yet? Valves would be more like a ticking sound than whistling, but it’s something that should be looked at regardless as part of a maintenance program.
 
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